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    変形菌類線

    Via A. Nicholas at Ghost of a Flea comes this report on one of the delightfully bizarre ways extremes sometimes meet. The photographs have a spooky beauty, too:

    When presented with oat flakes arranged in the pattern of Japanese cities around Tokyo, brainless, single-celled slime molds construct networks of nutrient-channeling tubes that are strikingly similar to the layout of the Japanese rail system, researchers from Japan and England report Jan. 22 in Science. A new model based on the simple rules of the slime mold’s behavior may lead to the design of more efficient, adaptable networks, the team contends.

    Every day, the rail network around Tokyo has to meet the demands of mass transport, ferrying millions of people between distant points quickly and reliably, notes study coauthor Mark Fricker of the University of Oxford. “In contrast, the slime mold has no central brain or indeed any awareness of the overall problem it is trying to solve, but manages to produce a structure with similar properties to the real rail network.”

    Initially, the slime mold dispersed evenly around the oat flakes, exploring its new territory. But within hours, the slime mold began to refine its pattern, strengthening the tunnels between oat flakes while the other links gradually disappeared. After about a day, the slime mold had constructed a network of interconnected nutrient-ferrying tubes. Its design looked almost identical to that of the rail system surrounding Tokyo, with a larger number of strong, resilient tunnels connecting centrally located oats. “There is a remarkable degree of overlap between the two systems,” Fricker says.

    Travelers on the Tokyo commuter rail systems often compare themselves to sushi packed in tight, so perhaps this whole ferrying-of-nutrients parallel isn’t so odd after all.

    2 Responses to “変形菌類線”

    1. Flea says:

      I still yearn to explore the subways of Tokyo!

    2. Sean says:

      The Tokyo subways are, indeed, a marvel. I miss them whenever I use our train tubes here in New York, believe me.

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